arc: use one of the interrupt stacks during early init
arc: use one of the interrupt stacks during early init

Same issue as with ARM. ARC can use _Swap() though, because the call to
it is serial, not generating a low-priority exception and interrupts are
locked until the main() thread is context-switched into and the
interrupt stack is released.

Fixes ZEP-1310.

Change-Id: Ie1f27f7ad0502191ca2867b5400d6e0bfb7f0fc6
Signed-off-by: Benjamin Walsh <578db18f23ec223e50c404886c947386478a464e@windriver.com>

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